"She bravely spoke about her illness in the media to raise awareness and funds for the Irish Cancer Society, participating in both Daffodil Day and Today FM’s Shave or Dye campaigns. Our thoughts are with her family and friends at this time.”

Devastated followers of the So She Knows Facebook page posted touching tributes to Ms Ryan.

One user wrote: "Devastated for you Donna, Paul and family, and all those who knew and loved this incredible woman.

"I am sending all my love from Australia, may you all seek comfort in the wonderful memories you have of such a beautiful girl. Sleep tight Sabrina. Xxxxx"

Another said: "It takes an amazingly wonderful person to dedicate their time and energy to helping others when they're sick whilst going through it themselves.

"Sosheknows is a beautiful legacy to leave behind in life. A perfect tribute to the kind, caring, selfless girl that Sabrina was.

"So sorry to Donna, Paul and her family for their loss. Much much love xxxxx."